Hw-044 Datasheet [2021] May 2026
The HW-044 is a widely used, inexpensive RS232 to TTL converter module typically built around the MAX3232 chip, allowing 3.0V to 5.5V operation for interfacing microcontrollers with legacy serial equipment. Because it is a generic module, users should rely on the MAX3232 IC datasheet for precise electrical characteristics while ensuring proper RX/TX alignment and VCC logic level matching. Connecting HCM375B-232-68N with arduino - Page 3
: To test if your HW-044 is working, short the TXD and RXD pins on the TTL side. Send a character via a terminal; if you see it echoed back, the module is functioning correctly. Troubleshooting Common Issues Garbage Characters : Usually caused by a mismatch in or a loose GND wire. No Response hw-044 datasheet
Issue 2: Switch Always Shows Pressed or Never Pressed
- Cause: Missing pull-up resistor.
- Fix: Enable the microcontroller’s internal pull-up (
pinMode(pin, INPUT_PULLUP)in Arduino). If using a raw MCU without pull-ups, add a 10kΩ resistor from SW to VCC.
// Center calibration (replace with your values) int centerX = 512; int centerY = 512; The HW-044 is a widely used, inexpensive RS232
5. Gain and Channel Configuration (Pin Strapping)
The HW-044 module allows you to configure the amplifier gain and audio channel selection by connecting the GAIN and SD_MODE pins to either VIN, GND, or leaving them floating. Cause: Missing pull-up resistor